TWI781097B - Interlayer film for laminated glass and laminated glass - Google Patents

Abstract

The present invention provides an interlayer film for laminated glass capable of improving the penetration resistance of laminated glass. The interlayer film for laminated glass of the present invention has one end and the other end located on the opposite side of the above-mentioned one end, and the thickness of the above-mentioned other end is greater than the thickness of the above-mentioned one end, does not contain or contain alkali metals, does not contain or contain alkaline earth metals, and Including magnesium, the magnesium content in the surface portion of the first region on the one end side of the intermediate film after heating at 150°C for 30 minutes, the total content of alkali metal, alkaline earth metal, and magnesium, and the above-mentioned intermediate after heating The magnesium content in the surface portion of the second region on the other end side of the film and the total content of alkali metal, alkaline earth metal and magnesium in the first and second regions of the intermediate film after heating satisfy a specific relationship.

Description

Interlayer film for laminated glass and laminated glass

The present invention relates to an interlayer film for laminated glass for obtaining laminated glass. Also, the present invention relates to a laminated glass using the above-mentioned interlayer film for laminated glass.

In general, even when laminated glass is damaged by external impact, the amount of scattered glass fragments is small, and it is excellent in safety. Therefore, the above-mentioned laminated glass is widely used in automobiles, rail vehicles, airplanes, ships, buildings, and the like. The above-mentioned laminated glass is produced by interposing an interlayer film for laminated glass between a pair of glass plates.

Also, a head-up display (HUD) is known as the above-mentioned laminated glass used in automobiles. HUD can display the measurement information such as speed as the driving data of the car on the windshield of the car.

The above-mentioned HUD has the following problem: the measurement information displayed on the windshield is regarded as a double image.

To suppress double images, a wedge-shaped intermediary is used. Patent Document 1 below discloses a laminated glass in which a wedge-shaped interlayer film having a specific wedge angle is interposed between a pair of glass plates. This kind of laminated glass can connect the display of the measurement information reflected by one glass plate and the display of the measurement information reflected by the other glass plate at one point in the driver’s field of vision by adjusting the wedge angle of the interlayer film. Therefore, the display of measurement information is less likely to be seen as a double image, and less likely to obstruct the driver's field of vision.

[Prior Art Literature] [Patent Document]

[Patent Document 1] Japanese Patent Application Laid-Open No. 4-502525

The wedge-shaped intermediate film as described in Patent Document 1 can suppress double images to a certain extent. However, since the interlayer is wedge-shaped, the interlayer has regions with a thinner thickness and regions with a thicker thickness. Therefore, in the laminated glass using an interlayer, there exists a problem that penetration resistance falls.

An object of the present invention is to provide an interlayer film for laminated glass capable of improving the penetration resistance of laminated glass. Furthermore, the object of the present invention is to provide a laminated glass using the above-mentioned interlayer film for laminated glass.

According to a broader aspect of the present invention, there can be provided an interlayer film for laminated glass (in this specification, sometimes simply referred to as "intermediate film"), which has one end and the other end located on the opposite side of the above-mentioned one end, And the thickness of the above-mentioned other end is greater than the thickness of the above-mentioned one end, does not contain or contain alkali metals, does not contain or contain alkaline earth metals, and contains magnesium, and the heated intermediate film is heated at 150°C for 30 minutes from the above-mentioned one end to the above-mentioned The position of 15 cm from the other end is the 3 cm square of the central line, and the magnesium content in the surface part of the first area is more than 1 ppm, and the position of 15 cm from the other end toward the above-mentioned one end is the 3 cm square of the central line of the intermediate film after the above heating The magnesium content in the surface portion of the second region is 1 ppm or more, and the alkali metal in the surface portion of the second region of the 3 cm square of the heated intermediate film is centered at a position 15 cm from the other end toward the one end. , the total content of alkaline earth metals and magnesium is 200ppm or less, and the total content of alkali metals, alkaline earth metals and magnesium in the surface portion of the second region of the above-mentioned heated interlayer film is greater than that of the above-mentioned first part of the above-mentioned heated interlayer film. The combined content of alkali metals, alkaline earth metals and magnesium in the surface portion of the zone.

In a specific aspect of the interlayer film of the present invention, the above-mentioned second aspect of the interlayer film after the above-mentioned heating The total content of alkali metal, alkaline earth metal and magnesium in the surface portion of the region is 1 ppm or more greater than the total content of alkali metal, alkaline earth metal and magnesium in the surface portion of the first region of the heated intermediate film.

The above-mentioned intermediate film preferably contains a thermoplastic resin. The above-mentioned intermediate film preferably contains a plasticizer.

In a specific aspect of the interlayer film of the present invention, the interlayer film includes a first layer and a second layer arranged on the first surface side of the first layer.

In a specific aspect of the interlayer film of the present invention, the first layer contains polyvinyl acetal resin, the second layer contains polyvinyl acetal resin, and the polyvinyl acetal in the first layer The hydroxyl content of the resin is lower than that of the polyvinyl acetal resin in the second layer.

In a specific aspect of the interlayer film of the present invention, the first layer contains polyvinyl acetal resin, the second layer contains polyvinyl acetal resin, the first layer contains a plasticizer, and the second layer A plasticizer is included, and the content of the above-mentioned plasticizer in the above-mentioned first layer is more than that in the above-mentioned second layer relative to 100 parts by weight of the above-mentioned polyvinyl acetal resin in the above-mentioned first layer. The content of 100 parts by weight of the above-mentioned polyvinyl acetal resin in the above-mentioned second layer.

According to a broader aspect of the present invention, there is provided a laminated glass comprising a first laminated glass member, a second laminated glass member, and the above-mentioned interlayer film for laminated glass, and the first laminated glass member The above-mentioned interlayer film for laminated glass is arranged between the above-mentioned second laminated glass member.

The interlayer film for laminated glass of the present invention has one end and the other end located on the opposite side of the above-mentioned one end, and the thickness of the above-mentioned other end is greater than the thickness of the above-mentioned one end, does not contain or contain alkali metals, does not contain or contain alkaline earth metals, And contains magnesium, heating at 150°C for 30 minutes The content of magnesium in the surface part of the first area of 3 cm square of the central line of the intermediate film after the position 15 cm from the above-mentioned one end toward the above-mentioned other end is 1 ppm or more, and the content of the above-mentioned heated intermediate film is from the above-mentioned other end toward the other end. The magnesium content in the surface part of the second area of the 3cm square of the central line at 15cm from the above-mentioned one end is 1ppm or more, and the 3cm square of the central line at the position of 15cm from the other end to the above-mentioned one end of the above-mentioned heated intermediate film The total content of alkali metals, alkaline earth metals and magnesium in the surface portion of the second region is 200ppm or less, and the total content of alkali metals, alkaline earth metals and magnesium in the surface portion of the second region of the interlayer film after heating is more The total content of alkali metal, alkaline earth metal and magnesium in the surface portion of the first region of the interlayer film after the heating can improve the penetration resistance of the laminated glass.

1: Layer 1

1A: Layer 1

1Aa: The part whose cross-sectional shape in the thickness direction is rectangular

1Ab: The section shape in the thickness direction is a wedge-shaped part

2: Layer 2

3: Layer 3

11: Intermediate film

11A: Intermediate film

11a: one end

11b: the other end

11Aa: The part whose cross-sectional shape in the thickness direction is rectangular

11Ab: The section shape in the thickness direction is a wedge-shaped part

21:Laminated glass

22: 1st laminated glass component

23: Second laminated glass component

51: Roller body

61: Core

R1: Display the corresponding area

R2: Surrounding area

R3: shaded area

Fig. 1(a) and (b) are a cross-sectional view and a front view schematically showing an interlayer film for laminated glass according to a first embodiment of the present invention.

2( a ) and ( b ) schematically show a cross-sectional view and a front view of an interlayer film for laminated glass according to a second embodiment of the present invention.

Fig. 3 is a cross-sectional view showing an example of laminated glass using the interlayer film for laminated glass shown in Fig. 1 .

Fig. 4 is a perspective view schematically showing a roll around which the interlayer film for laminated glass shown in Fig. 1 is wound.

Fig. 5 is a diagram for explaining a preloading method in dual image evaluation.

Hereinafter, the details of the present invention will be described.

The interlayer film for laminated glass of the present invention (in this specification, sometimes simply referred to as "intermediate film") is used for laminated glass.

The intermediate film of the present invention has a single-layer structure or a structure of two or more layers. The intermediate film of the present invention may have a single-layer structure, or may have a two-layer or more structure. The intermediate film of the present invention may have a two-layer structure, or may have a three-layer or more structure. The intermediate film of the present invention may be a single-layer intermediate film or a multi-layer intermediate film.

The intermediate film of the present invention has one end and the other end located on the opposite side to the above-mentioned one end. The above-mentioned one end and the above-mentioned other end are connected at opposite ends of the intermediate film. In the interlayer film of the present invention, the thickness of the other end is greater than the thickness of the one end.

The interlayer of the present invention does not contain or contain alkali metals. The interlayer film of the present invention may contain alkali metals or alkaline earth metals. The interlayer of the present invention does not contain or contain alkaline earth metals. The interlayer film of the present invention may not contain alkaline earth metal, or may contain alkaline earth metal. The interlayer film of the present invention contains magnesium.

When the interlayer film of the present invention is heated at 150° C. for 30 minutes to obtain a heated interlayer film, the present invention satisfies the following constitutions 1 to 4.

(Structure 1) The content of magnesium in the surface portion of the first area of the 3 cm square of the heated interlayer film with the position 15 cm from the one end toward the other end as the central line is 1 ppm or more.

(Structure 2) The content of magnesium in the surface portion of the second area of the 3 cm square of the intermediate film after the heating with the position 15 cm from the other end toward the one end as the central line is 1 ppm or more.

(Structure 3) The total content of alkali metals, alkaline earth metals and magnesium in the surface portion of the second area of the 3 cm square of the intermediate film after the heating, with the position 15 cm from the other end toward the one end as the central line, is 200 ppm or less .

(Structure 4) The above-mentioned heated intermediate film is 15cm from the other end to the one end The total content of alkali metals, alkaline earth metals and magnesium in the surface part of the second area of 3 cm square located on the central line is more than that of the above-mentioned heated intermediate film with the position 15 cm from the above-mentioned one end toward the above-mentioned other end as the central line The total content of alkali metals, alkaline earth metals and magnesium in the surface portion of the first area of 3 cm square.

Since the present invention has the above configuration, it is possible to suppress the double image of the laminated glass. In the present invention, when the display information is reflected from the display unit to the laminated glass, the generation of double images can be suppressed.

Furthermore, since this invention has the said structure, the penetration resistance of a laminated glass can be improved. In the present invention, the penetration resistance of the intermediate film can be improved in a well-balanced manner by both the thinner region and the thicker region.

The surface portion of the first region and the surface portion of the second region indicate a surface portion with a thickness of 10 μm. Since the interlayer film is laminated on the laminated glass member on the surface, the content of alkali metal, alkaline earth metal and magnesium on the surface will affect the penetration resistance. Furthermore, it is sufficient that the surface portion (first surface portion) on one side satisfies the above-mentioned constitutions 1 to 4. If the surface portion on one side satisfies the above-mentioned constitutions 1 to 4, the effect of the present invention can be obtained due to the surface portion on the one side. It is preferable that the surface portions (the first surface portion and the second surface portion) on both sides satisfy the above-mentioned configurations 1 to 4. If the surface portions on both sides satisfy the above-mentioned constitutions 1 to 4, the effect of the present invention can be effectively obtained.

From the viewpoint of effectively improving penetration resistance, the total content of alkali metals, alkaline earth metals and magnesium in the surface portion of the first region of the heated intermediate film is preferably 30 ppm or more, more preferably 35 ppm or more, Furthermore, it is more preferably 50 ppm or more, and is more preferably 160 ppm or less, more preferably 150 ppm or less, and still more preferably 130 ppm or less.

From the viewpoint of effectively improving penetration resistance, the total content of alkali metals, alkaline earth metals and magnesium in the surface portion of the second region of the heated intermediate film is preferably more than 30%. ppm, more preferably more than 35 ppm, more preferably more than 50 ppm, and preferably less than 160 ppm, more preferably less than 150 ppm, further preferably less than 130 ppm.

From the viewpoint of effectively improving penetration resistance, the total content of alkali metals, alkaline earth metals, and magnesium in the surface portion of the second region of the heated interlayer film is higher than that of the first region of the heated interlayer film. The total content of alkali metals, alkaline earth metals and magnesium in the surface portion of the glass is preferably at least 1 ppm, more preferably at least 3 ppm. From the viewpoint of maintaining impact resistance, the total content of alkali metal, alkaline earth metal, and magnesium in the surface portion of the second region of the interlayer after heating is the same as that of the surface of the first region of the interlayer after heating. The absolute value of the difference in the total content of alkali metals, alkaline earth metals, and magnesium in a portion is preferably at most 70 ppm, more preferably at most 50 ppm.

From the viewpoint of effectively improving penetration resistance, it is preferable that the magnesium content in the surface portion of the second region of the heated intermediate film is larger than that in the surface portion of the first region of the heated intermediate film. of magnesium content.

From the viewpoint of effectively improving penetration resistance, the magnesium content in the surface portion of the second region of the heated interlayer film is higher than the magnesium content in the surface portion of the first region of the heated interlayer film. It is preferably at least 1 ppm, more preferably at least 3 ppm. From the viewpoint of maintaining impact resistance, the difference between the magnesium content in the surface portion of the second region of the intermediate film after the heating and the magnesium content in the surface portion of the first region of the intermediate film after the heating The absolute value is preferably at most 70 ppm, more preferably at most 5 ppm.

From the viewpoint of effectively improving penetration resistance, the magnesium content in the surface portion of the first region of the heated intermediate film is preferably at least 1 ppm, more preferably at least 3 ppm, still more preferably at least 5 ppm, especially It is preferably at least 15 ppm, more preferably at most 200 ppm, more preferably at most 150 ppm, still more preferably at most 130 ppm, and most preferably at most 100 ppm.

From the viewpoint of effectively improving penetration resistance, the content of magnesium in the surface portion of the second region of the heated intermediate film is preferably 1 ppm or more, more preferably more than 1 ppm, still more preferably 3 ppm or more, and furthermore More preferably, it is more than 3ppm, especially preferably at least 5ppm, most preferably at least 15ppm, and is preferably at most 200ppm, more preferably at most 150ppm, further preferably at most 130ppm, and most preferably at most 100ppm.

From the viewpoint of effectively improving penetration resistance, the interlayer film of the present invention preferably contains potassium as an alkali metal.

From the viewpoint of effectively improving penetration resistance, the potassium content in the surface portion of the first region of the heated intermediate film is preferably at least 1 ppm, more preferably at least 3 ppm, and more preferably at most 200 ppm. Preferably it is 150 ppm or less, More preferably, it is 120 ppm or less.

From the viewpoint of effectively improving penetration resistance, the potassium content in the surface portion of the second region of the heated intermediate film is preferably 1 ppm or more, more preferably more than 1 ppm, still more preferably 3 ppm or more, especially More preferably, it is more than 3 ppm, and is preferably not more than 200 ppm, more preferably not more than 150 ppm, and still more preferably not more than 120 ppm.

From the point of view of suppressing double images more effectively, it is preferably more than 80% (more preferably 85%) of the area from the position 10cm from the above-mentioned one end to the above-mentioned other end to the position 59.8cm from the above-mentioned one end to the above-mentioned other end More than 90%, more preferably more than 90%, especially more than 95%), the thickness increases continuously from the above-mentioned one end to the above-mentioned other end.

The interlayer film of the present invention can be preferably used as a laminated glass for a head-up display (HUD). The interlayer film of the present invention is preferably an interlayer film for HUD.

The interlayer film of the present invention preferably has a display corresponding area corresponding to the display area of the HUD. The above-mentioned display corresponding area is an area where information can be displayed satisfactorily. From the viewpoint of suppressing double images more effectively, the interlayer film of the present invention is preferably formed from the above-mentioned one end toward the above-mentioned other end 10 The area from the position of cm to the position of 59.8 cm from the above-mentioned one end toward the above-mentioned other end has the above-mentioned display corresponding area.

From the viewpoint of effectively suppressing double images, the intermediate film preferably has a cross-sectional shape in the thickness direction in a region from a position of 10 cm from the above-mentioned one end toward the above-mentioned other end to a position of 59.8 cm from the above-mentioned one end toward the above-mentioned other end. wedge-shaped part.

The interlayer film of the present invention may also have shaded regions. The above-mentioned shaded area may be separated from the above-mentioned display corresponding area. The above-mentioned shaded area is provided, for example, to prevent the driver from being dazzled by sunlight or outdoor lighting while driving. The above-mentioned shaded area may also be provided in order to provide heat insulation. The above shaded area is preferably located at the edge of the intermediate film. The above-mentioned shaded area is preferably in the shape of a band.

In shaded areas, colorants or fillers may also be used in order to change the color and visible light transmission. The coloring agent or filler may be included in only a partial area in the thickness direction of the intermediate film, or may be included in the entire area in the thickness direction of the intermediate film.

From the viewpoint of making the display better and further expanding the field of view, the visible light transmittance of the display corresponding region is preferably 80% or higher, more preferably 88% or higher, and still more preferably 90% or higher. The visible light transmittance of the above display corresponding area is preferably higher than the visible light transmittance of the above shaded area. The visible light transmittance of the above-mentioned display corresponding area may also be lower than the visible light transmittance of the above-mentioned shaded area. The visible light transmittance of the region corresponding to the above display is preferably higher than the visible light transmittance of the shaded region by more than 50%, more preferably higher than 60%.

Furthermore, for example, in the interlayer film showing the corresponding area and the shaded area, when the visible light transmittance changes, the visible light transmittance is measured at the center position of the corresponding area and the center position of the shaded area.

A spectrophotometer ("U- 4100"), according to JIS R3211 (1998), the visible light transmittance of the obtained laminated glass at a wavelength of 380 to 780 nm was measured. In addition, as a glass plate, it is preferable to use the transparent glass of thickness 2mm.

The display corresponding area preferably has a length direction and a width direction. Since the interlayer film has excellent versatility, it is preferable that the width direction of the display-corresponding region is a direction connecting the one end and the other end. The above display corresponding area is preferably in the shape of a strip.

The above-mentioned intermediate film preferably has an MD direction and a TD direction. The intermediate film can be obtained, for example, by melt extrusion molding. The MD direction is the advancing direction of the interlayer film at the time of manufacture of the interlayer film. The TD direction is a direction perpendicular to the traveling direction of the intermediate film at the time of production of the intermediate film, and is a direction perpendicular to the thickness direction of the intermediate film. Preferably, the one end and the other end are located on both sides in the TD direction.

The said MD direction and TD direction can be confirmed by the winding direction of the roll body of an interlayer film, for example. The reason is that: in the roll body of the interlayer film, the interlayer film is wound up in the direction of travel of the interlayer film during manufacture, so the winding direction of the interlayer film on the roll body is the same as the direction of travel of the interlayer film during manufacture of the interlayer film. same.

From the viewpoint of improving display, the intermediate film preferably has a wedge-shaped cross-sectional shape in the thickness direction. Preferably, the cross-sectional shape in the thickness direction showing the corresponding region is wedge-shaped.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

In Fig. 1(a) and (b), the interlayer film for laminated glass according to the first embodiment of the present invention is schematically shown in cross-sectional view and front view. Fig. 1 (a) is a sectional view along line I-I in Fig. 1 (b). Furthermore, for the convenience of illustration, the size and dimension of the interlayer film in FIG. 1 and the figures described later are appropriately changed according to the actual size and shape.

In FIG. 1( a ), a cross section in the thickness direction of the intermediate film 11 is shown. Furthermore, Figure 1(a) and the following figures In the figure, for the convenience of illustration, the thickness of the intermediate film and each layer constituting the intermediate film, and the wedge angle θ are shown differently from the actual thickness and wedge angle.

The intermediate film 11 includes a first layer 1 (intermediate layer), a second layer 2 (surface layer), and a third layer 3 (surface layer). The second layer 2 is arranged and laminated on the first surface side of the first layer 1 . On the side of the second surface opposite to the first surface of the first layer 1, the third layer 3 is arranged and laminated. The first layer 1 is arranged and sandwiched between the second layer 2 and the third layer 3 . The interlayer film 11 is used to obtain laminated glass. The interlayer film 11 is an interlayer film for laminated glass. The intermediate film 11 is a multilayer intermediate film.

The intermediate film 11 has one end 11a and the other end 11b located on the opposite side of the one end 11a. One end 11a and the other end 11b are end portions on opposite sides. The cross-sectional shapes in the thickness direction of the second layer 2 and the third layer 3 are wedge-shaped. The cross-sectional shape in the thickness direction of the first layer 1 is rectangular. About the thickness of the 2nd layer 2 and the 3rd layer 3, the side of the other end 11b is larger than the side of the one end 11a. Therefore, the thickness of the other end 11b of the intermediate film 11 is greater than the thickness of the one end 11a. Therefore, the intermediate film 11 has a thinner region and a thicker region.

The interlayer film 11 has a display corresponding region R1 corresponding to the display region of the head-up display. The intermediate film 11 has a peripheral region R2 beside the display corresponding region R1. In this embodiment, the corresponding region R1 is shown as a region from a position of 10 cm from one end 11 a to the other end 11 b to a position of 59.8 cm from one end 11 a to the other end 11 b.

The intermediate film 11 has a shaded region R3 separated from the display corresponding region R1. The shaded region R3 is located at the edge of the intermediate film 11 .

Fig. 4 is a perspective view schematically showing a roll around which the interlayer film for laminated glass shown in Fig. 1 is wound.

The intermediate film 11 may also be wound and used as the roll body 51 of the intermediate film 11 .

The roll body 51 shown in FIG. 4 includes a winding core 61 and an intermediate film 11 . The intermediate film 11 is wound on the core 61 Outside the week.

In Fig. 2(a) and (b), the interlayer film for laminated glass according to the second embodiment of the present invention is schematically shown in cross-sectional view and front view. Fig. 2 (a) is a sectional view along line I-I in Fig. 2 (b). In FIG. 2( a ), a cross section in the thickness direction of the intermediate film 11A is shown.

The intermediate film 11A shown in FIG. 2 includes a first layer 1A. The intermediate film 11A has a one-layer structure of only the first layer 1A, and is a single-layer intermediate film. The intermediate film 11A is the first layer 1A. The interlayer film 11A is used to obtain laminated glass. The interlayer film 11A is an interlayer film for laminated glass.

The intermediate film 11A has one end 11a and the other end 11b located on the opposite side of the one end 11a. One end 11a and the other end 11b are end portions on opposite sides. The thickness of the other end 11b of the intermediate film 11A is greater than that of the one end 11a. Therefore, the intermediate film 11A and the first layer 1A have a thinner region and a thicker region.

The intermediate film 11A and the first layer 1A have rectangular sections 11Aa and 1Aa in the thickness direction and wedge-shaped sections 11Ab and 1Ab in the thickness direction.

The intermediate film 11A has a display corresponding region R1 corresponding to the display region of the head-up display. The intermediate film 11A has a peripheral region R2 beside the display corresponding region R1.

The intermediate film 11A has a shaded region R3 separated from the display corresponding region R1. The shaded region R3 is located at the edge of the intermediate film 11A.

The above-mentioned intermediate film preferably has a wedge-shaped cross-sectional shape in the thickness direction. The above-mentioned intermediate film preferably has a portion whose thickness gradually increases from one end to the other end. The cross-sectional shape of the interlayer film in the thickness direction is preferably wedge-shaped. Examples of the cross-sectional shape in the thickness direction of the interlayer include trapezoid, triangle, and pentagon.

In order to suppress the double image, the wedge angle θ of the interlayer film can be appropriately set according to the installation angle of the laminated glass. From the point of view of further suppressing double images, the wedge angle θ of the interlayer is preferably 0.2 It is more than mrad (0.0115 degrees), preferably less than 2 mrad (0.1146 degrees), more preferably less than 1 mrad (0.05273 degrees), and still more preferably less than 0.7 mrad (0.0401 degrees). The wedge angle θ of the above-mentioned intermediate film is defined as the straight line connecting the first surface (one surface) of the intermediate film between the maximum thickness portion and the minimum thickness portion of the intermediate film and the distance between the maximum thickness portion and the minimum thickness portion of the intermediate film. The interior angle at the intersection of the straight lines connecting the second surface (the other surface) of the intermediate film.

The thickness of the above-mentioned intermediate film is not particularly limited. The above-mentioned thickness of the intermediate film represents the total thickness of each layer constituting the intermediate film. Therefore, in the case of the multilayer intermediate film 11 , the thickness of the intermediate film represents the total thickness of the first layer 1 , the second layer 2 , and the third layer 3 .

The maximum thickness of the interlayer film is preferably at least 0.1 mm, more preferably at least 0.25 mm, still more preferably at least 0.5 mm, especially preferably at least 0.8 mm, and more preferably at most 3 mm, more preferably at most 2 mm, and still more preferably 1.5mm or less.

When the distance between one end and the other end is set as X, the intermediate film preferably has the minimum thickness in the area of 0X~0.2X from one end to the inside, and the area of 0X~0.2X from the other end to the inside Having the largest thickness, the interlayer film preferably has the smallest thickness in the area of 0X~0.1X from one end to the inner side, and has the largest thickness in the area of 0X~0.1X from the other end to the inner side. It is preferred that the interlayer film has the smallest thickness at one end and the interlayer film has the largest thickness at the other end. The intermediate film 11, 11A has the largest thickness at the other end 11b, and has the smallest thickness at the one end 11a.

From a practical point of view, and from the viewpoint of sufficiently improving adhesive force and penetration resistance, the maximum thickness of the surface layer is preferably 0.001 mm or more, more preferably 0.2 mm or more, further preferably 0.3 mm or more, and more preferably 0.001 mm or more. Preferably it is 1 mm or less, more preferably 0.8 mm or less.

From a practical viewpoint and a viewpoint of sufficiently improving penetration resistance, the maximum thickness of a layer (intermediate layer) arranged between two surface layers is preferably 0.001 mm or more, more preferably 0.1 mm. mm or more, more preferably 0.2 mm or more, and preferably 0.8 mm or less, more preferably 0.6 mm or less, still more preferably 0.3 mm or less.

The distance X between one end of the intermediate film and the other end is preferably 3 m or less, more preferably 2 m or less, particularly preferably 1.5 m or less, and preferably 0.5 m or more, more preferably 0.8 m or more, and most preferably 1 m or more .

The details of the materials constituting each layer of the multilayer interlayer film and the material of the single layer interlayer film will be described below.

(thermoplastic resin)

The intermediate film (each layer) preferably contains a thermoplastic resin (hereinafter, sometimes referred to as thermoplastic resin (0)), and the thermoplastic resin (0) preferably contains polyvinyl acetal resin (hereinafter, sometimes referred to as polyvinyl acetal resin). Vinyl acetal resin (0)). The above-mentioned first layer preferably contains a thermoplastic resin (hereinafter, sometimes referred to as thermoplastic resin (1)), and the thermoplastic resin (1) preferably contains polyvinyl acetal resin (hereinafter, sometimes referred to as polyethylene Alcohol acetal resin (1)). The above-mentioned second layer preferably contains a thermoplastic resin (hereinafter, sometimes referred to as thermoplastic resin (2)), and the thermoplastic resin (2) preferably contains polyvinyl acetal resin (hereinafter, sometimes referred to as polyethylene Alcohol acetal resin (2)). The above-mentioned third layer preferably contains thermoplastic resin (hereinafter sometimes described as thermoplastic resin (3)), and as thermoplastic resin (3), preferably contains polyvinyl acetal resin (hereinafter sometimes described as polyethylene Alcohol acetal resin (3)). The above-mentioned thermoplastic resin (1), the above-mentioned thermoplastic resin (2) and the above-mentioned thermoplastic resin (3) may be the same or different, and the above-mentioned thermoplastic resin (1) and the above-mentioned thermoplastic resin are preferably used in order to further improve the sound insulation. (2) is different from the above-mentioned thermoplastic resin (3). The above-mentioned polyvinyl acetal resin (1) and the above-mentioned polyvinyl acetal resin (2) and the above-mentioned polyvinyl acetal resin (3) may be the same or different, and in terms of further improving the sound insulation performance, the Preferably, the above polyvinyl acetal resin (1) is different from the above polyvinyl acetal resin (2) and the above polyvinyl acetal resin (3). same. The thermoplastic resin (0), the thermoplastic resin (1), the thermoplastic resin (2) and the thermoplastic resin (3) may be used alone or in combination of two or more. Only one kind of the polyvinyl acetal resin (0), the polyvinyl acetal resin (1), the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) may be used respectively, You may use 2 or more types together.

As said thermoplastic resin, polyvinyl acetal resin, ethylene-vinyl acetate copolymer resin, ethylene-acrylic acid copolymer resin, polyurethane resin, polyvinyl alcohol resin, etc. are mentioned. Thermoplastic resins other than these may also be used.

The aforementioned thermoplastic resin is preferably polyvinyl acetal resin. By using the polyvinyl acetal resin and the plasticizer in combination, the adhesion of the layer comprising the polyvinyl acetal resin and the plasticizer to the laminated glass member or other layers can be further improved.

The said polyvinyl acetal resin can be manufactured by acetalizing polyvinyl alcohol (PVA) with aldehyde, for example. The above polyvinyl acetal resin is preferably an acetal compound of polyvinyl alcohol. The said polyvinyl alcohol can be obtained by saponifying polyvinyl acetate, for example. The degree of saponification of the polyvinyl alcohol is generally in the range of 70 to 99.9 mol%.

The average degree of polymerization of the polyvinyl alcohol (PVA) is preferably at least 200, more preferably at least 500, further preferably at least 1500, still more preferably at least 1600, especially preferably at least 2600, most preferably at least 2700, and Preferably it is 5000 or less, more preferably 4000 or less, still more preferably 3500 or less. The penetration resistance of a laminated glass will improve more that the said average degree of polymerization is more than the said minimum. When the said average degree of polymerization is below the said upper limit, an intermediate film will be easy to shape|mold.

The average degree of polymerization of the polyvinyl alcohol can be determined by a method based on JIS K6726 "Testing methods for polyvinyl alcohol".

The carbon number of the acetal group contained in the polyvinyl acetal resin is not particularly limited. The aldehyde used in the production of the polyvinyl acetal resin is not particularly limited. The above-mentioned polyvinyl acetal tree The carbon number of the acetal group in the fat is preferably 3-5, more preferably 3 or 4. When the carbon number of the acetal group in the said polyvinyl acetal resin is 3 or more, the glass transition temperature of an interlayer film will fully fall.

The above-mentioned aldehyde is not particularly limited. In general, aldehydes with 1 to 10 carbon atoms can be preferably used. Examples of the above-mentioned aldehydes having 1 to 10 carbon atoms include propionaldehyde, n-butyraldehyde, isobutyraldehyde, n-pentanal, 2-ethylbutyraldehyde, n-hexanal, n-octylaldehyde, n-nonanal, n- Decyl aldehyde, formaldehyde, acetaldehyde and benzaldehyde, etc. Preferably, it is propionaldehyde, n-butyraldehyde, isobutyraldehyde, n-hexanal, or n-valeraldehyde, more preferably, it is propionaldehyde, n-butyraldehyde, or isobutyraldehyde, and still more preferably, it is n-butyraldehyde. The said aldehyde may use only 1 type, and may use 2 or more types together.

The hydroxyl group content (hydroxyl content) of the polyvinyl acetal resin (0) is preferably at least 15 mol%, more preferably at least 18 mol%, and is preferably at most 40 mol%, more preferably 35 mol%. Mole % or less. The adhesive force of an intermediate|membrane will improve more that the said hydroxyl group content rate is more than the said minimum. Moreover, the flexibility of an intermediate film improves that the said hydroxyl group content rate is below the said upper limit, and the handling of an intermediate film becomes easy.

The hydroxyl group content (hydroxyl content) of the polyvinyl acetal resin (1) is preferably at least 17 mol %, more preferably at least 20 mol %, further preferably at least 22 mol %, and more preferably at least 22 mol %. 28 mol % or less, more preferably 27 mol % or less, further preferably 25 mol % or less, especially preferably 24 mol % or less. The mechanical strength of an intermediate|membrane will improve more that the said hydroxyl group content rate is more than the said minimum. In particular, when the hydroxyl group content of the polyvinyl acetal resin (1) is 20 mol% or more, the reaction efficiency is high and the productivity is excellent, and if it is 28 mol% or less, the sound insulation of laminated glass is improved. performance is further improved. Moreover, the flexibility of an intermediate film improves that the said hydroxyl group content rate is below the said upper limit, and the handling of an intermediate film becomes easy.

The content of the hydroxyl groups in the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) is preferably at least 25 mol %, more preferably at least 28 mol %, more preferably at least 30 mol %. above ear%, More preferably more than 31.5 mol%, more preferably more than 32 mol%, especially preferably more than 33 mol%, and preferably less than 38 mol%, more preferably less than 37 mol%, and more preferably Preferably it is not more than 36.5 mol%, more preferably not more than 36 mol%. The adhesive force of an intermediate|membrane will improve more that the said hydroxyl group content rate is more than the said minimum. Moreover, the flexibility of an intermediate film improves that the said hydroxyl group content rate is below the said upper limit, and the handling of an intermediate film becomes easy.

From the viewpoint of further improving sound insulation, the hydroxyl content of the polyvinyl acetal resin (1) is preferably lower than the hydroxyl content of the polyvinyl acetal resin (2). From the viewpoint of further improving sound insulation, the hydroxyl content of the polyvinyl acetal resin (1) is preferably lower than the hydroxyl content of the polyvinyl acetal resin (3). From the viewpoint of further improving sound insulation, the absolute value of the difference between the hydroxyl content of the polyvinyl acetal resin (1) and the hydroxyl content of the polyvinyl acetal resin (2), and the polyvinyl alcohol The absolute value of the difference between the hydroxyl content of the acetal resin (1) and the hydroxyl content of the polyvinyl acetal resin (3) is preferably at least 1 mol%, more preferably at least 5 mol%. Preferably it is at least 9 mol%, particularly preferably at least 10 mol%, most preferably at least 12 mol%. The absolute value of the difference between the hydroxyl group content of the polyvinyl acetal resin (1) and the hydroxyl group content of the polyvinyl acetal resin (2), and the hydroxyl group content of the polyvinyl acetal resin (1) The absolute value of the difference from the hydroxyl group content of the polyvinyl acetal resin (3) is preferably 20 mol% or less.

The hydroxyl group content of the above-mentioned polyvinyl acetal resin is a value expressed as a percentage by the mole fraction obtained by dividing the amount of ethylidene groups bonded to hydroxyl groups by the total amount of ethylidene groups in the main chain. The amount of ethylidene groups bonded to the hydroxyl group can be measured in accordance with JIS K6728 "Testing method for polyvinyl butyral", for example.

The degree of acetylation (the amount of acetyl groups) of the polyvinyl acetal resin (0) is preferably at least 0.1 mol %, more preferably at least 0.3 mol %, still more preferably at least 0.5 mol %, and Preferably 30 moles % or less, more preferably less than 25 mol%, further preferably less than 20 mol%. The compatibility of a polyvinyl acetal resin and a plasticizer improves that the said degree of acetylation is more than the said minimum. When the said degree of acetylation is below the said upper limit, the moisture resistance of an interlayer film and a laminated glass will improve.

The degree of acetylation (the amount of acetyl groups) of the polyvinyl acetal resin (1) is preferably at least 0.01 mol %, more preferably at least 0.1 mol %, further preferably at least 7 mol %, and further preferably It is preferably at least 9 mol%, and more preferably at most 30 mol%, more preferably at most 25 mol%, further preferably at most 24 mol%, and especially preferably at most 20 mol%. The compatibility of a polyvinyl acetal resin and a plasticizer improves that the said degree of acetylation is more than the said minimum. When the said degree of acetylation is below the said upper limit, the moisture resistance of an interlayer film and a laminated glass will improve. In particular, when the degree of acetylation of the polyvinyl acetal resin (1) is 0.1 mol % or more and 25 mol % or less, the penetration resistance is excellent.

The degrees of acetylation of each of the above-mentioned polyvinyl acetal resin (2) and the above-mentioned polyvinyl acetal resin (3) are preferably at least 0.01 mol %, more preferably at least 0.5 mol %, and more preferably at least 10 mol %. Mole % or less, more preferably 2 Mole % or less. The compatibility of a polyvinyl acetal resin and a plasticizer improves that the said degree of acetylation is more than the said minimum. When the said degree of acetylation is below the said upper limit, the moisture resistance of an interlayer film and a laminated glass will improve.

The above-mentioned degree of acetylation is a value expressed as a percentage of the mole fraction obtained by dividing the amount of ethylidene groups bonded by acetyl groups by the total amount of ethylidene groups in the main chain. The amount of ethylidene groups bonded to the acetyl group can be measured, for example, in accordance with JIS K6728 "Testing method for polyvinyl butyral".

The degree of acetalization (degree of butyralization in the case of polyvinyl butyral resin) of the polyvinyl acetal resin (0) is preferably at least 60 mol%, more preferably at least 63 mol%. , and preferably less than 85 mol%, more preferably less than 75 mol%, and more preferably less than 70 mol%. The compatibility of a polyvinyl acetal resin and a plasticizer improves that the said degree of acetalization is more than the said minimum. If the above-mentioned degree of acetalization is below the above-mentioned upper limit, it is used for the reaction required for the production of polyvinyl acetal resin Time shortens.

The degree of acetalization of the polyvinyl acetal resin (1) (the degree of butyraldehyde in the case of polyvinyl butyral resin) is preferably at least 47 mol%, more preferably at least 60 mol%. , and preferably less than 85 mol%, more preferably less than 80 mol%, and more preferably less than 75 mol%. The compatibility of a polyvinyl acetal resin and a plasticizer improves that the said degree of acetalization is more than the said minimum. The reaction time required for manufacturing a polyvinyl acetal resin as the said degree of acetalization is below the said upper limit will shorten.

Each of the polyvinyl acetal resin (2) and the polyvinyl acetal resin (3) has a degree of acetalization (degree of butyralization in the case of polyvinyl butyral resin) of preferably 55 moles. mol% or more, more preferably 60 mol% or more, and preferably 75 mol% or less, more preferably 71 mol% or less. The compatibility of a polyvinyl acetal resin and a plasticizer improves that the said degree of acetalization is more than the said minimum. The reaction time required for manufacturing a polyvinyl acetal resin as the said degree of acetalization is below the said upper limit will shorten.

The above-mentioned degree of acetalization is the value obtained by subtracting the amount of ethylenic groups bonded to hydroxyl groups and the amount of ethylenic groups bonded to acetyl groups from the total amount of ethylenic groups in the main chain divided by the total amount of the main chain. The mole fraction obtained from the amount of ethyl is expressed as a percentage.

Furthermore, the above-mentioned hydroxyl content rate (hydroxyl content), degree of acetalization (degree of butyralization) and degree of acetylation are preferably measured by a method based on JIS K6728 "Test method for polyvinyl butyral" calculated from the obtained results. However, assays based on ASTM D1396-92 may also be used. When the polyvinyl acetal resin is a polyvinyl butyral resin, the above-mentioned hydroxyl group content rate (hydroxyl group content), the above-mentioned degree of acetalization (degree of butyraldehyde) and the above-mentioned degree of acetylation can be determined based on Calculated based on the measured results of JIS K6728 "Test method for polyvinyl butyral".

(Plasticizer)

From the viewpoint of further improving the adhesive force of the intermediate film, the intermediate film of the present invention preferably contains a plasticizer (hereinafter, it may be described as a plasticizer (0)). It is preferable that the said 1st layer contains a plasticizer (it may describe hereafter as a plasticizer (1)). It is preferable that the said 2nd layer contains a plasticizer (it may describe hereafter as a plasticizer (2)). It is preferable that the said 3rd layer contains a plasticizer (it may describe hereafter as a plasticizer (3)). When the thermoplastic resin contained in the interlayer film is a polyvinyl acetal resin, it is particularly preferable that the interlayer film (each layer) contains a plasticizer. The layer containing polyvinyl acetal resin preferably contains a plasticizer.

The above-mentioned plasticizer is not particularly limited. As the above-mentioned plasticizer, a conventionally known plasticizer can be used. The said plasticizer may use only 1 type, and may use 2 or more types together.

Examples of the plasticizer include organic ester plasticizers such as monobasic organic acid esters and polybasic organic acid esters, and organic phosphoric acid plasticizers such as organic phosphoric acid plasticizers and organic phosphorous acid plasticizers. Organic ester plasticizers are preferred. The above-mentioned plasticizer is preferably a liquid plasticizer.

As said monobasic organic acid ester, the diol ester obtained by reaction of diol and a monobasic organic acid, etc. are mentioned. Triethylene glycol, tetraethylene glycol, tripropylene glycol, etc. are mentioned as said diol. Examples of the monobasic organic acid include butyric acid, isobutyric acid, hexanoic acid, 2-ethylbutyric acid, heptanoic acid, n-octanoic acid, 2-ethylhexanoic acid, n-nonanoic acid, and capric acid.

As said polybasic organic acid ester, the ester compound etc. of polybasic organic acid and the alcohol which has a linear or branched structure of carbon number 4-8 are mentioned. Adipic acid, sebacic acid, azelaic acid, etc. are mentioned as said polyhydric organic acid.

Examples of the organic ester plasticizer include: triethylene glycol bis(2-ethylpropionate), triethylene glycol bis(2-ethylbutyrate), triethylene glycol bis(2-ethylbutyrate), triethylene glycol bis(2-ethylpropionate), hexanoate), triethylene glycol dicaprylate, triethylene glycol di-n-caprylate, triethylene glycol di-n-heptanoate, tetraethylene glycol di-n-heptanoate, dibutyl sebacate ester, dioctyl azelate, dibutyl carbitol adipate, ethylene glycol bis(2-ethane butyrate), 1,3-propanediol bis(2-ethylbutyrate), 1,4-butanediol bis(2-ethylbutyrate), diethylene glycol bis(2-ethylbutyrate) butyrate), diethylene glycol bis(2-ethylhexanoate), dipropylene glycol bis(2-ethylbutyrate), triethylene glycol bis(2-ethylvalerate), tetraethyl Glycol bis(2-ethylbutyrate), diethylene glycol dicaprylate, dihexyl adipate, dioctyl adipate, hexyl adipate cyclohexyl adipate, heptyl adipate Mixture with nonyl adipate, diisononyl adipate, diisodecyl adipate, nonyl heptyl adipate, dibutyl sebacate, oil-modified sebacic alkyd, and Mixture of phosphate ester and adipate, etc. Organic ester plasticizers other than these may also be used. Adipate esters other than those mentioned above may also be used.

Examples of the organic phosphoric acid plasticizer include tri(butoxyethyl)phosphate, isodecylphenylphosphate, and triisopropylphosphate.

The above-mentioned plasticizer is preferably a diester plasticizer represented by the following formula (1).

In the above formula (1), R1 and R2 respectively represent an organic group with 5-10 carbon atoms, R3 represents an ethylidene group, an isopropylidene group or a n-propylidene group, and p represents an integer of 3-10. R1 and R2 in the above formula (1) are each preferably an organic group having 6 to 10 carbon atoms.

The above-mentioned plasticizer preferably comprises triethylene glycol bis(2-ethylhexanoate) (3GO) or triethylene glycol bis(2-ethylbutyrate) (3GH), more preferably comprises triethylene glycol bis(2-ethylhexanoate) (3GH). Diol bis(2-ethylhexanoate).

The content of the plasticizer (0) in the intermediate film is preferably at least 25 parts by weight, more preferably at least 30 parts by weight, and preferably at most 100 parts by weight, relative to 100 parts by weight of the thermoplastic resin (0). More preferably, it is 60 weight part or less, More preferably, it is 50 weight part or less. The penetration resistance of laminated glass will improve more that content of the said plasticizer (0) is more than the said minimum. If the above When content of a plasticizer (0) is below the said upper limit, the transparency of an intermediate film will improve more.

The content of the plasticizer (1) relative to 100 parts by weight of the thermoplastic resin (1) (hereinafter, sometimes referred to as the content (1)) is preferably 5 parts by weight or more, more preferably 55 parts by weight or more, Furthermore, it is more preferably 60 parts by weight or more, and is more preferably 100 parts by weight or less, more preferably 90 parts by weight or less, still more preferably 85 parts by weight or less, especially preferably 80 parts by weight or less. The flexibility of an interlayer film improves that the said content (1) is more than the said minimum, and the handling of an interlayer film becomes easy. The penetration resistance of a laminated glass will further improve that the said content (1) is below the said upper limit.

The content of the above-mentioned plasticizer (2) relative to 100 parts by weight of the above-mentioned thermoplastic resin (2) (hereinafter, may be described as content (2)), and the content of the above-mentioned plasticizer (3) relative to the above-mentioned thermoplastic resin (3) 100 parts The content in parts by weight (hereinafter, sometimes described as content (3)) is preferably 10 parts by weight or more, more preferably 15 parts by weight or more, further preferably 20 parts by weight or more, especially preferably 24 parts by weight or more, And it is preferably not more than 40 parts by weight, more preferably not more than 35 parts by weight, still more preferably not more than 32 parts by weight, especially preferably not more than 30 parts by weight. The flexibility of an intermediate film improves that the said content (2) and the said content (3) are more than the said minimum, and the handling of an intermediate film becomes easy. The penetration resistance of a laminated glass will further improve that said content (2) and said content (3) are below the said upper limit.

In order to improve the sound insulation of laminated glass, the above content (1) is preferably more than the above content (2), and the above content (1) is preferably more than the above content (3).

From the viewpoint of further improving the sound insulation of the laminated glass, the absolute value of the difference between the above-mentioned content (2) and the above-mentioned content (1), and the absolute value of the difference between the above-mentioned content (3) and the above-mentioned content (1) are respectively compared with It is preferably at least 10 parts by weight, more preferably at least 15 parts by weight, and still more preferably at least 20 parts by weight. The absolute value of the difference between the above-mentioned content (2) and the above-mentioned content (1), and the absolute value of the difference between the above-mentioned content (3) and the above-mentioned content (1) are preferably 80 parts by weight or less, more preferably 75 parts by weight or less , and more preferably 70 parts by weight or less.

(insulation compound)

The above-mentioned intermediate film preferably contains a heat-shielding compound. The above-mentioned first layer preferably contains a heat-shielding compound. The above-mentioned second layer preferably contains a heat-shielding compound. The above-mentioned third layer preferably contains a heat-shielding compound. The said heat-shielding compound may use only 1 type, and may use 2 or more types together.

The heat-shielding compound preferably contains at least one component X selected from phthalocyanine compounds, naphtholcyanine compounds, and anthracyanine compounds, or contains heat-shielding particles. In this case, both the above-mentioned component X and the above-mentioned heat-shielding particles may be contained.

Ingredient X:

The above-mentioned intermediate film preferably contains a phthalocyanine compound, a naphtholcyanine compound, or an anthracyanine compound (hereinafter, the phthalocyanine compound, the naphtholcyanine compound, and the anthracenephthalocyanine compound may be referred to as component X). It is preferable that the said 1st layer contains the said component X. It is preferable that the said 2nd layer contains the said component X. It is preferable that the said 3rd layer contains the said component X. The above-mentioned component X is a heat-shielding compound. The said component X may use only 1 type, and may use 2 or more types together.

The above-mentioned component X is not particularly limited. As component X, conventionally known phthalocyanine compounds, naphtholcyanine compounds, and anthracenephthalocyanine compounds can be used.

Examples of the above-mentioned component X include phthalocyanine, derivatives of phthalocyanine, naphtholcyanine, derivatives of naphthocyanine, anthracyanine, derivatives of anthracyanine, and the like. Each of the above-mentioned phthalocyanine compound and the above-mentioned derivative of phthalocyanine preferably has a phthalocyanine skeleton. It is preferable that each of the said naphthol cyanine compound and the said derivative of naphthol cyanine has a naphthol cyanine skeleton. Each of the above-mentioned anthracyanine compound and the above-mentioned derivative of anthracyanine preferably has an anthracyanine skeleton.

From the viewpoint of further improving the thermal insulation of the interlayer film and laminated glass, the above-mentioned component X is preferably phthalocyanine, a derivative of phthalocyanine, a naphthol cyanine or a derivative of naphthol cyanine, more preferably phthalocyanine or Derivatives of phthalocyanines.

It is preferable that the above-mentioned component X contains vanadium atoms or copper atoms from the viewpoint of effectively improving heat-shielding properties and maintaining visible light transmittance at a higher level for a long period of time. The above-mentioned component X preferably contains vanadium atoms, and preferably contains copper atoms. The above-mentioned component X is more preferably a phthalocyanine containing a vanadium atom or a copper atom, or a derivative of phthalocyanine containing a vanadium atom or a copper atom. From the viewpoint of further improving the thermal insulation properties of the interlayer film and laminated glass, the above-mentioned component X is preferably a structural unit having an oxygen atom bonded to a vanadium atom.

In 100% by weight of the above-mentioned intermediate film or in 100% by weight of the layer (first layer, second layer or third layer) containing the above-mentioned component X, the content of the above-mentioned component X is preferably 0.001% by weight or more, more preferably 0.005% by weight % or more, more preferably 0.01% by weight or more, especially preferably 0.02% by weight or more, and preferably 0.2% by weight or less, more preferably 0.1% by weight or less, further preferably 0.05% by weight or less, especially preferably 0.04% by weight Weight% or less. When content of the said component X is more than the said minimum and below the said upper limit, heat-shielding property will fully improve, and visible light transmittance will fully improve. For example, the visible light transmittance can be set to 70% or more.

Insulation Particles:

The above-mentioned intermediate film preferably contains heat-shielding particles. The above-mentioned first layer preferably contains the above-mentioned heat-shielding particles. It is preferable that the said 2nd layer contains the said heat-shielding particle|grains. It is preferable that the said 3rd layer contains the said heat-shielding particle|grains. The above-mentioned heat-shielding particles are heat-shielding compounds. By using heat-shielding particles, infrared rays (heat rays) can be effectively blocked. The said heat shielding particle|grains may use only 1 type, and may use 2 or more types together.

From the viewpoint of further improving the heat-shielding properties of the laminated glass, the heat-shielding particles are more preferably metal oxide particles. The above-mentioned heat shielding particles are preferably particles made of metal oxides (metal oxide particles).

Compared with ultraviolet rays, infrared rays with a wavelength longer than visible light of 780nm have less energy. However, the thermal effect of infrared rays is greater, if infrared rays are absorbed by substances, it will be in the form of heat released. For this reason, infrared rays are often referred to as heat rays. Infrared rays (heat rays) can be effectively blocked by using the heat shielding particles. Furthermore, the so-called heat-shielding particles refer to particles capable of absorbing infrared rays.

Specific examples of the above heat-shielding particles include aluminum-doped tin oxide particles, indium-doped tin oxide particles, antimony-doped tin oxide particles (ATO particles), gallium-doped zinc oxide particles (GZO particles), indium-doped zinc oxide particles ( IZO particles), aluminum-doped zinc oxide particles (AZO particles), niobium-doped titanium oxide particles, sodium-doped tungsten oxide particles, cesium-doped tungsten oxide particles, thallium-doped tungsten oxide particles, rubidium-doped tungsten particles, tin-doped indium oxide particles ( ITO particles), metal oxide particles such as tin-doped zinc oxide particles, silicon-doped zinc oxide particles, or lanthanum hexaboride (LaB ₆ ) particles, etc. Heat shielding particles other than these may also be used. Since the shielding function of heat rays is high, it is preferably metal oxide particles, more preferably ATO particles, GZO particles, IZO particles, ITO particles or tungsten oxide particles, especially preferably ITO particles or tungsten oxide particles. In particular, tin-doped indium oxide particles (ITO particles) are preferred, and tungsten oxide particles are also preferred because they have a high shielding function against heat rays and are easy to obtain.

The tungsten oxide particles are preferably metal-doped tungsten oxide particles from the viewpoint of further improving the heat insulation properties of the interlayer film and laminated glass. Metal-doped tungsten oxide particles are included in the above-mentioned "tungsten oxide particles". Specific examples of the metal-doped tungsten oxide particles include sodium-doped tungsten oxide particles, cesium-doped tungsten oxide particles, thallium-doped tungsten oxide particles, and rubidium-doped tungsten oxide particles.

From the viewpoint of further improving the heat insulation properties of the interlayer film and laminated glass, cesium-doped tungsten oxide particles are particularly preferable. From the viewpoint of further improving the thermal insulation of the interlayer film and laminated glass, the cesium-doped tungsten oxide particles are preferably tungsten oxide particles represented by the formula: Cs _0.33 WO ₃ .

The average particle diameter of the heat shielding particles is preferably at least 0.01 μm, more preferably at least 0.02 μm, and preferably at most 0.1 μm, more preferably at most 0.05 μm. The shielding property of a heat ray will fully improve that an average particle diameter is more than the said minimum. If the average particle size is below the above upper limit, then The dispersibility of thermal particles is improved.

The above "average particle diameter" means a volume average particle diameter. The average particle diameter can be measured using a particle size distribution measuring device (“UPA-EX150” manufactured by Nikkiso Co., Ltd.) or the like.

In 100% by weight of the above-mentioned intermediate film or in 100% by weight of the layer (first layer, second layer or third layer) containing the above-mentioned heat-shielding particles, each content of the above-mentioned heat-shielding particles (especially the content of tungsten oxide particles) is higher than that of the above-mentioned heat-shielding particles. Preferably at least 0.01% by weight, more preferably at least 0.1% by weight, more preferably at least 1% by weight, especially preferably at least 1.5% by weight, and preferably at most 6% by weight, more preferably at most 5.5% by weight, and further preferably at least 1.5% by weight. Preferably it is 4% by weight or less, especially preferably 3.5% by weight or less, most preferably 3% by weight or less. When content of the said heat-shielding particle|grains is more than the said minimum and below the said upper limit, heat-shielding property will fully improve, and visible light transmittance will fully improve.

(metal salt)

The above-mentioned intermediate film preferably contains an alkali metal salt, an alkaline earth metal salt, or a magnesium salt (hereinafter, these may be described as metal salt M). Due to the above-mentioned metal salt M, the above-mentioned intermediate film preferably contains an alkali metal. Due to the above-mentioned metal salt M, the above-mentioned intermediate film preferably contains an alkaline earth metal. Due to the above-mentioned metal salt M, the above-mentioned intermediate film preferably contains magnesium. It is preferable that the said 1st layer contains the said metal salt M. It is preferable that the said 2nd layer contains the said metal salt M. The above-mentioned third layer preferably contains the above-mentioned metal salt M. By using the above-mentioned metal salt M, it is easy to control the adhesion between the interlayer film and laminated glass members such as glass plates or the adhesion between the layers of the interlayer film. The said metal salt M may use only 1 type, and may use 2 or more types together.

The above metal salt M preferably contains Li, Na, K, Rb, Cs, Mg, Ca, Sr or Ba. The metal salt contained in the interlayer preferably contains K or Mg.

Also, the above-mentioned metal salt M is more preferably an alkali metal salt of an organic acid with 2 to 16 carbons, an alkaline earth metal salt of an organic acid with 2 to 16 carbons, or a magnesium salt of an organic acid with 2 to 16 carbons, and more preferably is carbon number Magnesium carboxylate with 2-16 carbons or potassium carboxylate with 2-16 carbons.

The magnesium salt of carboxylic acid having 2 to 16 carbon atoms and the potassium salt of carboxylic acid having 2 to 16 carbon atoms are not particularly limited, for example, magnesium acetate, potassium acetate, magnesium propionate, potassium propionate, 2- Magnesium ethylbutyrate, potassium 2-ethylbutyrate, magnesium 2-ethylhexanoate, potassium 2-ethylhexanoate, etc.

The total content of Mg and K in the intermediate film containing the above-mentioned metal salt M, or the layer (first layer, second layer, or third layer) containing the above-mentioned metal salt M is preferably 5 ppm or more, more preferably 10 pp m or more, more preferably 20 ppm or more, and preferably 300 ppm or less, more preferably 250 ppm or less, further preferably 200 ppm or less. When the total content of Mg and K is more than the above-mentioned lower limit and below the above-mentioned upper limit, the adhesion between the interlayer film and a laminated glass member such as a glass plate or between layers in the interlayer film can be better controlled.

(ultraviolet screening agent)

It is preferable that the said intermediate film contains an ultraviolet-ray shielding agent. It is preferable that the said 1st layer contains an ultraviolet-ray shielding agent. It is preferable that the said 2nd layer contains an ultraviolet-ray shielding agent. It is preferable that the said 3rd layer contains an ultraviolet-ray shielding agent. By using an ultraviolet shielding agent, even if the interlayer film and laminated glass are used for a long time, the visible light transmittance is difficult to further decrease. The said ultraviolet shielding agent may use only 1 type, and may use 2 or more types together.

Ultraviolet absorbers are contained in the said ultraviolet shielding agent. The above-mentioned ultraviolet shielding agent is preferably an ultraviolet absorber.

結構之紫外線遮蔽劑(三

化合物)、具有丙二酸酯結構之紫外線遮蔽劑(丙二酸酯化合物)、具有草醯苯胺結構之紫外線遮蔽劑(草 醯苯胺化合物)及具有苯甲酸酯結構之紫外線遮蔽劑(苯甲酸酯化合物)等。 Examples of the above-mentioned ultraviolet shielding agent include: ultraviolet shielding agents containing metal atoms, ultraviolet shielding agents containing metal oxides, ultraviolet shielding agents having a benzotriazole structure (benzotriazole compounds), benzophenone containing The structure of ultraviolet shielding agent (benzophenone compound), has three

Structural UV screening agent (3

compound), UV screening agent with malonate structure (malonate compound), UV screening agent with oxanilide structure (oxanilide compound) and UV screening agent with benzoate structure (benzyl ester compounds), etc.

Examples of the ultraviolet shielding agent containing metal atoms include platinum particles, particles obtained by coating the surface of platinum particles with silica, palladium particles, and particles obtained by covering the surface of palladium particles with silica. The ultraviolet shielding agent is preferably not heat-shielding particles.

結構之紫外線遮蔽劑或具有苯甲酸酯結構之紫外線遮蔽劑，更佳為具有苯并三唑結構之紫外線遮蔽劑或具有二苯甲酮結構之紫外線遮蔽劑，進而較佳為具有苯并三唑結構之紫外線遮蔽劑。 The above-mentioned ultraviolet shielding agent is preferably an ultraviolet shielding agent having a benzotriazole structure, an ultraviolet shielding agent having a benzophenone structure,

UV screener with benzoate structure or UV screener with benzoate structure, more preferably UV screener with benzotriazole structure or UV screener with benzophenone structure, and more preferably with benzotriazole UV shielding agent with azole structure.

As an ultraviolet shielding agent containing the said metal oxide, zinc oxide, titanium oxide, cerium oxide, etc. are mentioned, for example. Furthermore, the surface may be coated also about the said ultraviolet shielding agent containing a metal oxide. Examples of the coating material for the surface of the ultraviolet shielding agent containing metal oxides include insulating metal oxides, hydrolyzable organosilicon compounds, polysiloxane compounds, and the like.

As said insulating metal oxide, silica, alumina, zirconia, etc. are mentioned. The above-mentioned insulating metal oxide has, for example, a band gap energy of 5.0 eV or more.

Examples of the ultraviolet shielding agent having a benzotriazole structure include 2-(2'-hydroxy-5'-methylphenyl)benzotriazole ("Tinuvin P" manufactured by BASF Corporation), 2- (2'-Hydroxy-3',5'-Di-tert-butylphenyl)benzotriazole ("Tinuvin 320" manufactured by BASF Corporation), 2-(2'-Hydroxy-3'-tert-butyl -5-methylphenyl)-5-chlorobenzotriazole ("Tinuvin 326" manufactured by BASF Corporation), and 2-(2'-hydroxy-3',5'-dipentylphenyl)benzo Triazole ("Tinuvin 328" manufactured by BASF Corporation) etc. In terms of excellent performance in shielding ultraviolet rays, the above-mentioned purple The external ray shielding agent is preferably an ultraviolet shielding agent having a benzotriazole structure containing a halogen atom, more preferably an ultraviolet shielding agent having a benzotriazole structure containing a chlorine atom.

As an ultraviolet shielding agent which has the said benzophenone structure, octylphenone ("Chimassorb 81" by BASF company) etc. are mentioned, for example.

結構之紫外線遮蔽劑，例如可列舉：ADEKA公司製造之「LA-F70」及2-(4,6-二苯基-1,3,5-三

-2-基)-5-[(己基)氧基]苯酚(BASF公司製造之「Tinuvin 1577FF」)等。 As the above has three

The ultraviolet shielding agent of the structure, for example, "LA-F70" manufactured by ADEKA company and 2-(4,6-diphenyl-1,3,5-tri

-2-yl)-5-[(hexyl)oxy]phenol ("Tinuvin 1577FF" manufactured by BASF Corporation) and the like.

Examples of the ultraviolet shielding agent having a malonate structure include: dimethyl 2-(p-methoxybenzylidene)malonate, 2,2-(1,4-phenylene dimethylene ) tetraethyl dimalonate, bis(1,2,2,6,6-pentamethyl 4-piperidinyl) 2-(p-methoxybenzylidene)malonate, etc.

As a commercial item of the ultraviolet shielding agent which has the said malonate structure, Hostavin B-CAP, Hostavin PR-25, Hostavin PR-31 (all are the Clariant company make) are mentioned.

As the ultraviolet shielding agent having the above-mentioned oxalyl aniline structure, N-(2-ethylphenyl)-N'-(2-ethoxy-5-tert-butylphenyl) oxalyl amide, N -(2-Ethylphenyl)-N'-(2-Ethoxy-phenyl) Oxamidamide, 2-Ethyl-2'-Ethoxy-Oxidamide (manufactured by Clariant Company "Sanduvor VSU ”) and other oxamides with substituted aryl groups on nitrogen atoms.

Examples of the ultraviolet shielding agent having the above-mentioned benzoate structure include: 2,4-di-tert-butylphenyl 3,5-di-tert-butyl-4-hydroxybenzoate (manufactured by BASF Co., Ltd. Tinuvin 120"), etc.

From the viewpoint of further suppressing the decrease in visible light transmittance after the lapse of time, in 100% by weight of the above-mentioned intermediate film or in 100% by weight of the layer (first layer, second layer or third layer) containing the above-mentioned ultraviolet shielding agent, The content of the above-mentioned ultraviolet shielding agent and the content of benzotriazole compound are better 0.1% by weight or more, more preferably 0.2% by weight or more, more preferably 0.3% by weight or more, especially preferably 0.5% by weight or more, and preferably 2.5% by weight or less, more preferably 2% by weight or less, and more preferably It is preferably at most 1% by weight, particularly preferably at most 0.8% by weight. In particular, by making the content of the ultraviolet shielding agent 0.2% by weight or more in 100% by weight of the layer containing the ultraviolet shielding agent, it is possible to remarkably suppress a decrease in the visible light transmittance of the interlayer film and laminated glass over time.

(Antioxidants)

The above-mentioned intermediate film preferably contains an antioxidant. It is preferable that the said 1st layer contains an antioxidant. It is preferable that the said 2nd layer contains an antioxidant. The above-mentioned third layer preferably contains an antioxidant. The said antioxidant may use only 1 type, and may use 2 or more types together.

As said antioxidant, a phenolic antioxidant, a sulfur type antioxidant, a phosphorus antioxidant, etc. are mentioned. The said phenolic antioxidant is an antioxidant which has a phenol skeleton. The above sulfur-based antioxidant is an antioxidant containing a sulfur atom. The above-mentioned phosphorus-based antioxidant is an antioxidant containing a phosphorus atom.

The above antioxidant is preferably a phenolic antioxidant or a phosphorus antioxidant.

Examples of the phenolic antioxidants include: 2,6-di-tert-butyl-p-cresol (BHT), butyl hydroxyanisole (BHA), 2,6-di-tert-butyl-4-ethyl Phenol, β-(3,5-di-tert-butyl-4-hydroxyphenyl) stearyl propionate, 2,2'-methylenebis(4-methyl-6-butylphenol), 2 ,2'-methylenebis(4-ethyl-6-tert-butylphenol), 4,4'-butylene-bis(3-methyl-6-tert-butylphenol), 1,1 ,3-tris(2-methyl-hydroxy-5-tert-butylphenyl)butane, tetrakis[methylene-3-(3',5'-butyl-4-hydroxyphenyl)propanoic acid ester] methane, 1,3,3-tris(2-methyl-4-hydroxy-5-tert-butylphenol) butane, 1,3,5-trimethyl-2,4,6-tris( 3,5-di-tert-butyl-4-hydroxybenzyl)benzene, bis(3,3'-tert-butylphenol)butyric acid diol ester and triethylene glycol bis(3-tert-butyl Base-4-hydroxy-5-methylphenylpropionate) etc. One or more of these antioxidants can be preferably used.

Examples of the above-mentioned phosphorus-based antioxidants include: tridecyl phosphite, tri(tridecyl) phosphite, triphenyl phosphite, tris(nonylphenyl) phosphite, pentaerythritol diphosphite bis( Tridecyl) ester, bis(decyl) pentaerythritol diphosphite, tris(2,4-di-tert-butylphenyl) phosphite, bis(2,4-di-tert-butyl- 6-methylphenyl)ethyl ester, and 2,2'-methylenebis(4,6-di-tert-butyl-1-phenyloxy)(2-ethylhexyloxy)phosphorus, etc. One or more of these antioxidants can be preferably used.

Examples of commercially available products of the antioxidant include "IRGANOX 245" manufactured by BASF Corporation, "IRGAFOS 168" manufactured by BASF Corporation, "IRGAFOS 38" manufactured by BASF Corporation, and "Sumilizer BHT" manufactured by Sumitomo Chemical Industries, Ltd. , "H-BHT" manufactured by Sakai Chemical Industry Co., Ltd., and "IRGANOX 1010" manufactured by BASF Corporation.

In order to maintain the higher visible light transmittance of the interlayer film and laminated glass for a long time, in 100% by weight of the above-mentioned interlayer film or in 100% by weight of the layer (the first layer, the second layer or the third layer) containing the antioxidant, the above-mentioned anti-oxidant The content of the oxidizing agent is preferably at least 0.1% by weight. Also, since the effect of the addition of the antioxidant is saturated, the content of the antioxidant is preferably 2% by weight or less in 100% by weight of the interlayer film or 100% by weight of the layer containing the antioxidant.

(other ingredients)

The above-mentioned first layer, the above-mentioned second layer and the above-mentioned third layer may also contain coupling agents, dispersants, surfactants, flame retardants, antistatic agents, pigments, dyes, moisture resistance agents, fluorescent whitening agents, etc. Additives such as agents and infrared absorbers. These additives may be used alone or in combination of two or more.

(laminated glass)

Fig. 3 is a cross-section showing an example of a laminated glass using the interlayer film for laminated glass shown in Fig. 1 view.

Laminated glass 21 shown in FIG. 3 includes interlayer film 11 , first laminated glass member 22 , and second laminated glass member 23 . The interlayer film 11 is arranged and sandwiched between the first laminated glass member 22 and the second laminated glass member 23 . The first laminated glass member 22 is disposed on the first surface of the interlayer film 11 . The second laminated glass member 23 is arranged on the second surface of the intermediate film 11 opposite to the first surface.

As said laminated glass member, a glass plate, a PET (polyethylene terephthalate) film, etc. are mentioned. The above-mentioned laminated glass includes not only laminated glass with an interlayer film interposed between two glass plates, but also laminated glass with an interlayer film interposed between a glass plate and a PET film or the like. The laminated glass is preferably a laminate including glass plates, and at least one glass plate is used. Preferably, the first laminated glass member and the second laminated glass member are glass plates or PET (polyethylene terephthalate) films, and the intermediate film includes at least one glass plate as the first laminated glass member. A laminated glass member and the above-mentioned second laminated glass member. More preferably, both the first laminated glass member and the second laminated glass member are glass plates.

Inorganic glass and organic glass are mentioned as said glass plate. Examples of the inorganic glass include float plate glass, heat-absorbing plate glass, heat-reflecting plate glass, polished plate glass, template glass, wire plate glass, green glass, and the like. The organic glass mentioned above is a synthetic resin glass that replaces the inorganic glass. As said organic glass, a polycarbonate board, a poly(meth)acrylic resin board, etc. are mentioned. As said poly(meth)acrylic-type resin board, a polymethyl(meth)acrylate board etc. are mentioned.

The respective thicknesses of the first laminated glass member and the second laminated glass member are not particularly limited, but are preferably 1 mm or more and preferably 5 mm or less. When the above-mentioned laminated glass member is a glass plate, the thickness of the glass plate is preferably not less than 1 mm and preferably not more than 5 mm. In the case where the above-mentioned laminated glass member is a PET film, the thickness of the PET film is preferably 0.03 mm or less. above, and preferably less than 0.5 mm.

The method for producing the above-mentioned laminated glass is not particularly limited. For example, the above-mentioned interlayer film is sandwiched between the above-mentioned first and second laminated glass members, and passed through a pressing roller, or placed in a rubber bag, and vacuum-suctioned. Thereby, the air remaining between the first laminated glass member and the interlayer film and the second laminated glass member and the interlayer film are degassed. Thereafter, pre-bonding is performed at about 70 to 110° C. to obtain a laminate. Then, put the laminate into an autoclave, or press it, and crimp it at about 120~150°C and a pressure of 1~1.5MPa. Laminated glass can be obtained in this way.

The above-mentioned laminated glass can be used in automobiles, rail vehicles, airplanes, ships, buildings, and the like. The above-mentioned laminated glass is preferably a laminated glass for buildings or vehicles, more preferably a laminated glass for vehicles. The above-mentioned laminated glass can also be used in addition to these uses. The above-mentioned laminated glass can be used in windshield glass, side window glass, rear glass or roof glass of automobiles. The above-mentioned laminated glass can be preferably used in automobiles due to its high thermal insulation and high transmittance of visible light.

The above-mentioned laminated glass is used as a laminated glass for a head-up display (HUD). The above-mentioned laminated glass can project measurement information such as speed sent from the control unit to the windshield from the display unit of the instrument panel. Therefore, the driver of the car can simultaneously recognize the front vision and measurement information without reducing the vision.

Hereinafter, examples are disclosed to describe the present invention in more detail. The present invention is not limited to these Examples.

When the polyvinyl acetal resin used is acetalized, n-butyraldehyde with 4 carbon atoms is used. Regarding the polyvinyl acetal resin, the degree of acetalization (degree of butyralization), the degree of acetylation, and the hydroxyl group content were measured by a method based on JIS K6728 "Testing methods for polyvinyl butyral". In addition, when measuring by ASTM D1396-92, the same numerical value as the method based on JJS K6728 "polyvinyl butyral test method" was shown.

(Example 1)

Preparation of composition for forming interlayer film:

Add triethylene glycol di (2-Ethylhexanoate) (3GO) 40 parts by weight, Tinuvin 326 (2-(2'-hydroxy-3'-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole , "Tinuvin 326" manufactured by BASF Corporation) 0.2 parts by weight, BHT (2,6-di-tert-butyl-p-cresol) 0.2 parts by weight, magnesium 2-ethylbutyrate, and potassium acetate, and fully Kneading is carried out to obtain a composition for forming an intermediate film.

Production of interlayer film:

The composition for forming the intermediate film is extruded using an extruder. In Example 1, the interlayer film was extruded to form a wedge-shaped single-layer interlayer film. When making this intermediate film, by making the addition amount of 2-ethyl magnesium butyrate and potassium acetate different, the content of Mg and K in the obtained intermediate film obtained is the value shown in the following table 1. interlayer. The intermediate film obtained has a minimum thickness at one end and a maximum thickness at the other end.

(comparative example 1)

In addition to making the thickness of the intermediate film uniform, changing the thickness of the intermediate film as shown in Table 1 below, and changing the contents of Mg and K in the obtained intermediate film as shown in Table 1 below, , In the same manner as in Example 1, a non-wedge-shaped single-layer interlayer film was obtained.

(comparative example 2)

A wedge-shaped single-layer interlayer was obtained in the same manner as in Example 1 except that the contents of Mg and K in the obtained interlayer were changed as shown in Table 1 below. The intermediate film obtained has a minimum thickness at one end and a maximum thickness at the other end.

(Example 2)

Preparation of the composition for forming the first layer:

Add triethylene glycol di (2-Ethylhexanal ester) (3GO) 60 parts by weight, Tinuvin 326 (2-(2'-hydroxy-3'-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole , "Tinuvin 326" manufactured by BASF Corporation) 0.2 parts by weight, and BHT (2,6-bis-tert-butyl-p-cresol) 0.2 parts by weight, and fully kneaded with a mixing roller to obtain the first layer composition.

Preparation of compositions for forming the 2nd and 3rd layers:

Add triethylene glycol di (2-Ethylhexanoate) (3GO) 38 parts by weight, Tinuvin 326 (2-(2'-hydroxy-3'-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole , "Tinuvin 326" manufactured by BASF Corporation) 0.2 parts by weight, BHT (2,6-di-tert-butyl-p-cresol) 0.2 parts by weight, magnesium 2-ethylbutyrate, and potassium acetate, and fully Kneading is carried out to obtain compositions for forming the second layer and the third layer.

Production of interlayer film:

The composition for forming the first layer and the compositions for forming the second and third layers were coextruded using a coextruder. Fabricate a wedge-shaped interlayer film with a laminated structure of 2nd layer/1st layer/3rd layer. When making this intermediate film, by making the addition of 2-ethyl magnesium butyrate and potassium acetate different, the content of Mg and K in the obtained intermediate film is obtained as the value shown in the following table 2. interlayer. The intermediate film obtained has a minimum thickness at one end and a maximum thickness at the other end.

(Example 3~7)

Except having changed the content of Mg and K in the obtained intermediate film as shown in following Table 2, it carried out similarly to Example 2, and obtained the wedge-shaped multilayer intermediate film. the middle of the obtained The film has a minimum thickness at one end and a maximum thickness at the other end.

(comparative example 3)

In addition to making the thickness of the intermediate film uniform, changing the thickness of the intermediate film as shown in Table 2 below, and changing the contents of Mg and K in the obtained intermediate film as shown in Table 2 below, , In the same manner as in Example 2, a non-wedge-shaped multilayer interlayer film was obtained.

(comparative example 4)

Except having changed the content of Mg and K in the obtained intermediate film as shown in following Table 2, it carried out similarly to Example 2, and obtained the wedge-shaped multilayer intermediate film. The intermediate film obtained has a minimum thickness at one end and a maximum thickness at the other end.

(Evaluation)

(1) Total content of magnesium, alkali metal and alkaline earth metal

The obtained intermediate film was heated at 150° C. for 30 minutes to obtain a heated intermediate film.

Cut out the first area of 3 cm square of the obtained heated intermediate film with the position 15 cm from the above-mentioned one end toward the above-mentioned other end as the central line, and then cut out the surface part of the first area with a thickness of 10 μm to obtain the first measurement sample. Furthermore, regarding the direction perpendicular to the direction connecting one end and the other end, the first measurement sample was cut out at the center position of the interlayer film in the direction perpendicular to the direction.

Also, cut out the second area of the 3 cm square of the obtained heated intermediate film with the position 15 cm from the other end toward the above-mentioned one end as the central line, and then cut out the surface part of the second area with a thickness of 10 μm to obtain the second area. 2 Determination of samples. Furthermore, regarding the direction perpendicular to the direction connecting one end and the other end, a second measurement sample was cut out at the center position of the interlayer film in the direction perpendicular to the direction.

In the obtained first measurement sample and second measurement sample, the total content of magnesium, alkali metal, and alkaline earth metal was measured. Furthermore, in the first measurement sample and the second measurement sample obtained In, only magnesium and potassium are included as magnesium, alkali metal and alkaline earth metal.

Also, the above-mentioned content was measured on the surface portions on both sides of the intermediate film, and as a result, the content was the same in the surface portion on one side and the surface portion on the other side.

(2) Dual image

Prepare a pair of glass plates (transparent glass, size 510mm×910mm, thickness 2.0mm). An interlayer film having a size corresponding to the size of the glass plates is sandwiched between a pair of glass plates to obtain a laminate. As shown in FIG. 5 , the obtained laminate was embedded in a rubber tube (frame member) made of EPDM (Ethylene Propylene Diene Monomer, ethylene-propylene-diene monomer). The width of the rubber tube is 15mm. Next, the laminated body embedded in the rubber tube made of EPDM was pre-compressed by the vacuum bag method. A laminated glass was obtained by press-bonding the pre-press-bonded laminate at 150° C. and a pressure of 1.2 MPa using an autoclave.

The obtained laminated glass is installed at the position of the windshield. The display information is reflected from the display unit placed under the laminated glass to the laminated glass, and the presence or absence of double images is visually confirmed at a specific position. The double images were judged using the following criteria.

[Criteria for judging double images]

○: Double image not confirmed

×: double image confirmed

(3) Penetration resistance

A first region of 30 cm square was cut out from the obtained heated interlayer film with the position 15 cm from the above-mentioned one end toward the above-mentioned other end as the central line. The cut interlayer film was sandwiched between two sheets of transparent float glass (30 cm long x 30 cm wide x 2.5 mm thick) to obtain a laminate. Put the laminate into a rubber bag, degas it at a vacuum of 2.6kPa for 20 minutes, then move it directly into an oven while maintaining the degassed state, and then keep it at 90°C for 30 minutes for vacuum pressing. The laminate is pre-crimped. In an autoclave, the pre-compression-bonded laminate was pressure-bonded at 135° C. and a pressure of 1.2 MPa for 20 minutes to obtain a first laminated glass (length 30 cm×width 30 cm).

A second area of 30 cm square was cut out from the obtained heated interlayer film with the position 15 cm from the other end toward the one end as the central line. The cut interlayer film was sandwiched between two sheets of transparent float glass (length 30 cm x width 30 cm x thickness 2.5 mm) to obtain a laminate. Put the laminate into a rubber bag and degas it at a vacuum of 2.6kPa for 20 minutes. After that, keep the degassed state and move it directly to the oven, and then keep it at 90°C for 30 minutes for vacuum pressing, so that the laminate The body is pre-crimped. In an autoclave, the pre-compressed laminate was press-bonded at 135° C. and a pressure of 1.2 MPa for 20 minutes to obtain a second laminated glass (length 30 cm×width 30 cm).

The obtained first laminated glass and second laminated glass were adjusted so that the surface temperature became 23° C., and the following penetration resistance test was implemented.

According to JIS R3212, for 6 sheets of laminated glass, a rigid ball with a mass of 2260g and a diameter of 82mm is dropped to the center of the laminated glass from a height of 4m. For all 6 sheets of laminated glass, the situation that the rigid ball did not penetrate within 5 seconds after the rigid ball collided was regarded as acceptable. If the number of laminated glass pieces that are not penetrated by the rigid ball within 5 seconds after the rigid ball collides is less than 3, it is regarded as unqualified. In the case of 4 pieces, re-evaluate the penetration resistance of 6 pieces of laminated glass. In the case of 5 pieces, add a new piece of laminated glass for the test, and the situation that the rigid ball does not penetrate within 5 seconds after the collision of the rigid ball is regarded as qualified. Using the same method, for 6 pieces of laminated glass, drop a rigid ball with a mass of 2260g and a diameter of 82mm from a height of 5m and 6m to the central part of the laminated glass, and evaluate the penetration resistance of the laminated glass. The penetration resistance was judged by the following criteria.

[Criteria for judging penetration resistance]

○○: 6m also qualified

○: Qualified at 4m, and unqualified at 5m or 6m

×: Unqualified at 4m

Details and results are shown in Tables 1 and 2 below.

Furthermore, in the laminated glass using the interlayer films obtained in Examples 2 to 7, the sound insulation performance was evaluated based on the sound transmission loss, and it was confirmed that the sound insulation performance was excellent.

Claims (8)

An interlayer film for laminated glass, which has one end and the other end located on the opposite side of the above-mentioned one end, and the thickness of the above-mentioned other end is greater than the thickness of the above-mentioned one end, and the distance from the above-mentioned one end to the above-mentioned other end is 0.5m or more, and Including magnesium, the content of magnesium in the surface part of the first area of 3 cm square of the heated intermediate film after heating at 150 ° C for 30 minutes with the position 15 cm from the above-mentioned one end toward the above-mentioned other end as the central line is 1 ppm or more, the above-mentioned The content of magnesium in the surface part of the second area of the 3 cm square of the heated intermediate film, which is 15 cm from the other end to the above one end as the central line, is 1 ppm or more. The total content of alkali metal, alkaline earth metal and magnesium in the surface portion of the second area of 3 cm square from the central line at a position 15 cm from the above-mentioned one end is 200 ppm or less, and in the surface portion of the above-mentioned second area of the intermediate film after the heating The total content of alkali metals, alkaline earth metals and magnesium is greater than the total content of alkali metals, alkaline earth metals and magnesium in the surface portion of the first region of the intermediate film after the heating. The interlayer film for laminated glass according to claim 1, wherein the total content of alkali metal, alkaline earth metal and magnesium in the surface portion of the second region of the interlayer film after heating is higher than that in the first region of the interlayer film after heating. The total content of alkali metals, alkaline earth metals and magnesium in the surface portion of the region is 1 ppm or more. The interlayer film for laminated glass according to claim 1 or 2, comprising a thermoplastic resin. The interlayer film for laminated glass according to claim 1 or 2, which contains a plasticizer. The interlayer film for laminated glass according to claim 1 or 2, comprising a first layer and a second layer disposed on the first surface side of the first layer. The interlayer film for laminated glass according to claim 5, wherein the first layer contains polyvinyl acetal resin, the second layer contains polyvinyl acetal resin, and the polyvinyl acetal in the first layer is The hydroxyl content of the resin is lower than that of the polyvinyl acetal resin in the second layer. The interlayer film for laminated glass according to claim 5, wherein the first layer contains polyvinyl acetal resin, the second layer contains polyvinyl acetal resin, the first layer contains a plasticizer, and the second layer contains a plasticizer. The layer contains a plasticizer, and the content of the above-mentioned plasticizer in the above-mentioned first layer relative to 100 parts by weight of the above-mentioned polyvinyl acetal resin in the above-mentioned first layer is more than that in the above-mentioned second layer. Content of 100 parts by weight of the above-mentioned polyvinyl acetal resin in the above-mentioned second layer. A laminated glass comprising a first laminated glass member, The second laminated glass member, and the interlayer film for laminated glass according to any one of claims 1 to 7, wherein the laminated glass member is disposed between the first laminated glass member and the second laminated glass member Interlayer film for glass.

Images